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	<div id="winchm_template_button"><A href="idebugeventcallbacks_changedebuggeestate.htm" title="Previous topic"><img id="winchm_template_prev" alt="Previous topic" src="../template2/btn_prev_n.gif" border="0"></a><A href="idebugeventcallbacks_changesymbolstate.htm" title="Next topic"><img id="winchm_template_next" alt="Next topic" src="../template2/btn_next_n.gif" border="0"></a></div>
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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugging_resources.htm">Debugging Resources</A> &gt; <A href="debugger_engine_and_extension_apis.htm">Debugger Engine and Extension APIs</A> &gt; <A href="using_the_debugger_engine_api.htm">Using the Debugger Engine API</A> &gt; <A href="debugger_engine_reference.htm">Debugger Engine Reference</A> &gt; <A href="callback_com_interfaces.htm">Callback Debug Engine Interfaces</A> &gt; <A href="idebugeventcallbacks.htm">IDebugEventCallbacks</A> &gt; </div>
	<div id="winchm_template_title">ChangeEngineState</div>
</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The <b>ChangeEngineState</b> callback method is called by the engine when its state has changed.</p>
<h2>Syntax</h2>
<div class="code"><span codelanguage="ManagedCPlusPlus"><table>
<tr>
<th>C++</th>
</tr>
<tr>
<td>
<pre>HRESULT ChangeEngineState(
  [in] ULONG   Flags,
  [in] ULONG64 Argument
);</pre>
</td>
</tr>
</table></span></div>
<h2>Parameters</h2>
<dl>
<dt><i>Flags</i> [in]</dt>
<dd>
<p>Specifies a bit-set indicating the type of changes that occurred in the engine's state.  The following bit flags might be set:</p>
<table>
<tr>
<th>Value</th>
<th>Description</th>
</tr>
<tr>
<td>
<p>DEBUG_CES_CURRENT_THREAD</p>
</td>
<td>
<p>The current thread has changed, which implies that the current target and current process might also have changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_EFFECTIVE_PROCESSOR</p>
</td>
<td>
<p>The effective processor has changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_BREAKPOINTS</p>
</td>
<td>
<p>One or more <a href="#Bookmark1931">breakpoints</a> have changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_CODE_LEVEL</p>
</td>
<td>
<p>The code interpretation level has changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_EXECUTION_STATUS</p>
</td>
<td>
<p>The execution status has changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_ENGINE_OPTIONS</p>
</td>
<td>
<p>The engine options have changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_LOG_FILE</p>
</td>
<td>
<p>The log file has been opened or closed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_RADIX</p>
</td>
<td>
<p>The default radix has changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_EVENT_FILTERS</p>
</td>
<td>
<p>The event filters have changed.  </p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_PROCESS_OPTIONS</p>
</td>
<td>
<p>The process options for the current process have changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_EXTENSIONS</p>
</td>
<td>
<p>Extension DLLs have been loaded or unloaded. (For more information, see <a href="#Bookmark1301">Loading Debugger Extension DLLs</a>.)</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_SYSTEMS</p>
</td>
<td>
<p>A target has been added or removed.  </p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_ASSEMBLY_OPTIONS</p>
</td>
<td>
<p>The assemble options have changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_EXPRESSION_SYNTAX</p>
</td>
<td>
<p>The default expression syntax has changed.</p>
</td>
</tr>
<tr>
<td>
<p>DEBUG_CES_TEXT_REPLACEMENTS</p>
</td>
<td>
<p>Text replacements have changed.  </p>
</td>
</tr>
</table>
<p> </p>
</dd>
<dt><i>Argument</i> [in]</dt>
<dd>
<p>Provides additional information about the change to the engine's state.  If more than one bit flag is set in the <i>Flags</i> parameter, the <i>Argument</i> parameter is not used.  Otherwise, the interpretation of the value of <i>Argument</i> depends on the value of <i>Flags</i>:</p>
<p></p>
<dl>
<dt><a id="DEBUG_CES_CURRENT_THREAD"></a><a id="debug_ces_current_thread"></a>DEBUG_CES_CURRENT_THREAD</dt>
<dd>
<p>The value of <i>Argument</i> is the current engine thread ID or--if there is no current thread--DEBUG_ANY_ID.  For more information, see <a href="#Bookmark221">Threads and Processes</a>.</p>
</dd>
<dt><a id="DEBUG_CES_EFFECTIVE_PROCESSOR"></a><a id="debug_ces_effective_processor"></a>DEBUG_CES_EFFECTIVE_PROCESSOR</dt>
<dd>
<p>The value of <i>Argument</i> is the type of the effective processor.</p>
</dd>
<dt><a id="DEBUG_CES_BREAKPOINTS"></a><a id="debug_ces_breakpoints"></a>DEBUG_CES_BREAKPOINTS</dt>
<dd>
<p>The value of <i>Argument</i> is the breakpoint ID of the breakpoint that was changed or--if more than one breakpoint was changed--DEBUG_ANY_ID.  For more information, see <a href="#Bookmark213">Breakpoints</a>.</p>
</dd>
<dt><a id="DEBUG_CES_CODE_LEVEL"></a><a id="debug_ces_code_level"></a>DEBUG_CES_CODE_LEVEL</dt>
<dd>
<p>The value of <i>Argument</i> is the code interpretation level.</p>
</dd>
<dt><a id="DEBUG_CES_EXECUTION_STATUS"></a><a id="debug_ces_execution_status"></a>DEBUG_CES_EXECUTION_STATUS</dt>
<dd>
<p>The value of <i>Argument</i> is the execution status (as described in the <a href="#Bookmark898"><b>DEBUG_STATUS_XXX</b></a> topic) possibly combined with the bit flag DEBUG_STATUS_INSIDE_WAIT. DEBUG_STATUS_INSIDE_WAIT is set when a <b>WaitForEvent</b> call is pending. For more information, see <a href="#Bookmark194">Debugging Session and Execution Model</a>.</p>
</dd>
<dt><a id="DEBUG_CES_ENGINE_OPTIONS"></a><a id="debug_ces_engine_options"></a>DEBUG_CES_ENGINE_OPTIONS</dt>
<dd>
<p>The value of <i>Argument</i> is the engine options. </p>
</dd>
<dt><a id="DEBUG_CES_LOG_FILE"></a><a id="debug_ces_log_file"></a>DEBUG_CES_LOG_FILE</dt>
<dd>
<p>The value of <i>Argument</i> is <b>TRUE</b> if the log file was opened and <b>FALSE</b> if the log file was closed.</p>
</dd>
<dt><a id="DEBUG_CES_RADIX"></a><a id="debug_ces_radix"></a>DEBUG_CES_RADIX</dt>
<dd>
<p>The value of <i>Argument</i> is the default radix.</p>
</dd>
<dt><a id="DEBUG_CES_EVENT_FILTERS"></a><a id="debug_ces_event_filters"></a>DEBUG_CES_EVENT_FILTERS</dt>
<dd>
<p>The value of <i>Argument</i> is the index of the event filter that was changed or--if more than one event filter was changed--DEBUG_ANY_ID.</p>
</dd>
<dt><a id="DEBUG_CES_PROCESS_OPTIONS"></a><a id="debug_ces_process_options"></a>DEBUG_CES_PROCESS_OPTIONS</dt>
<dd>
<p>The value of <i>Argument</i> is the process options for the current process.</p>
</dd>
<dt><a id="DEBUG_CES_EXTENSIONS"></a><a id="debug_ces_extensions"></a>DEBUG_CES_EXTENSIONS</dt>
<dd>
<p>The value of <i>Argument</i> is zero.</p>
</dd>
<dt><a id="DEBUG_CES_SYSTEMS"></a><a id="debug_ces_systems"></a>DEBUG_CES_SYSTEMS</dt>
<dd>
<p>The value of <i>Argument</i> is the target ID of the target that was added or--if a target was removed--DEBUG_ANY_ID.</p>
</dd>
<dt><a id="DEBUG_CES_ASSEMBLE_OPTIONS"></a><a id="debug_ces_assemble_options"></a>DEBUG_CES_ASSEMBLE_OPTIONS</dt>
<dd>
<p>The value of <i>Argument</i> is the assemble options.</p>
</dd>
<dt><a id="DEBUG_CES_EXPRESSION_SYNTAX"></a><a id="debug_ces_expression_syntax"></a>DEBUG_CES_EXPRESSION_SYNTAX</dt>
<dd>
<p>The value of <i>Argument</i> is the default expression syntax.</p>
</dd>
<dt><a id="DEBUG_CES_TEXT_REPLACEMENTS"></a><a id="debug_ces_text_replacements"></a>DEBUG_CES_TEXT_REPLACEMENTS</dt>
<dd>
<p>The value of <i>Argument</i> is DEBUG_ANY_ID.</p>
</dd>
</dl>
</dd>
</dl>
<h2>Return value</h2>
<p>The return value is ignored by the engine unless it indicates a remote procedure call error; in this case the client, with which this <b>IDebugEventCallbacks</b> object is registered, is disabled.</p>
<h2>Remarks</h2>
<p>This method is only called by the engine if the DEBUG_EVENT_CHANGE_ENGINE_STATE flag is set in the mask returned by <a href="#Bookmark796"><b>IDebugEventCallbacks::GetInterestMask</b></a>.</p>
<p>For more information about handling events, see <a href="#Bookmark210">Monitoring Events</a>. </p>
<h2>Requirements</h2>
<table>
<tr>
<th width="30%">
<p>Target platform</p>
</th>
<td width="70%">
<dl>
<dt></dt>
</dl>
</td>
</tr>
<tr>
<th width="30%">
<p>Header</p>
</th>
<td width="70%">
<dl>
<dt>Dbgeng.h (include Dbgeng.h)</dt></dl></td></tr></table></div></div>	
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